摘要
主动式喷粉抑爆装置是煤矿甲烷爆炸的防控装备之一,该装置装填的超细粉体抑爆剂可在甲烷爆炸初期主动喷洒,使其中超细粉体颗粒形成冷气溶胶,减少后续甲烷爆炸危害。为进一步提升主动式喷粉抑爆装置的抑爆性能,探究冷气溶胶抑爆剂的抑爆规律,使用5 L爆炸管道系统,测试了N_(2)和CO_(2)两种惰性气体对KHCO_(3)冷气溶胶甲烷抑爆性能的影响。试验结果表明:N2、CO_(2)显著强化了KHCO_(3)冷气溶胶对9.5%甲烷/空气预混气的抑制性能,相比于空气驱动的KHCO_(3)冷气溶胶,气体介质中含有惰性气体的KHCO_(3)冷气溶胶使甲烷爆炸最大压力下降更为显著,到达峰值压力时间也更长;CO2对KHCO_(3)冷气溶胶抑爆性能的增效作用强于N2。其中,体积分数0.03 g/L的KHCO_(3)冷气溶胶仅使甲烷最大爆炸压力降低60.4%,而在气体介质内充入体积分数15%~20%的N2或5%~10%的CO2时,同浓度KHCO_(3)冷气溶胶可以完全抑制甲烷爆炸,继续增加惰性气体的体积分数可以进一步减少KHCO_(3)冷气溶胶用量,从而降低主动式喷粉抑爆装置的成本。试验考察了在不同浓度KHCO_(3)冷气溶胶与不同体积分数N2、CO2作用下的甲烷爆炸情况,得到了KHCO_(3)冷气溶胶与惰性气体的最佳抑爆用量配比,能够为基于KHCO_(3)冷气溶胶的主动式喷粉抑爆装置的设计提供理论依据及技术参数。此外,讨论了含惰性气体的KHCO_(3)冷气溶胶系统的甲烷抑爆机理,并分析了惰性气体的增效原因。
Active powder spraying and explosion suppression device is one of the prevention and control equipment for methane explosion in coal mines.It can be actively sprayed at the initial stage of methane explosion after being filled with ultra-fine powder explosion suppres⁃sant,so that ultra-fine powder particles form cold aerosols and reduce the hazards of subsequent methane explosion.In order to further im⁃prove the explosion suppression performance of the active explosion suppression device,and to explore the explosion suppression law of cold aerosol explosion suppression agents,the methane explosion suppression characteristics of KHCO_(3)cold aerosol driven by inert gas was tested using a 5 L explosion tube system.The experimental results showed that N2 and CO_(2) significantly enhance the suppression perform⁃ance of KHCO_(3)cold aerosol on 9.5%methane/air premixed gas explosion,which revealed lower max-pressure and longer time to maxpressure on methane explosion compared with the suppression by KHCO_(3)cold aerosol driven by air.Among them,0.03 g/L KHCO_(3)cold aerosol reduced the max-pressure of methane explosion by 60.4%,but when the gas medium is filled with 15%~20%N2 or 5%~10%CO2,the same concentration of KHCO_(3)cold aerosol can completely suppress the explosion of methane.As the volume fraction of inert gas increased,the amount of KHCO_(3)cold aerosol was further reduced,thereby reducing the cost of active explosion suppression device.The experiment investigated the explosion of methane under the action of different concentrations of KHCO_(3)cold aerosols and different volume fractions of N_(2) and CO_(2),and obtained the optimal combination ratio of KHCO_(3)cold aerosols and inert gases,which can provide theoretical basis and technical parameters for the design of active explosion suppression system based on KHCO_(3)cold aerosol.In addition,the meth⁃ane suppression mechanism of the KHCO_(3)cold aerosol system containing inert gas was discussed,and the reason for the synergistic effect of inert gas was analyzed.
作者
王燕
林森
李忠
李璐
温小萍
纪文涛
WANG Yan;LIN Sen;LI Zhong;LI Lu;WEN Xiaoping;JI Wentao(College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Heuan Polytechnic University State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization,Jiaozuo 454000,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2021年第2期145-152,共8页
Coal Science and Technology
基金
国家自然科学基金资助项目(51874120,51904094)
中国博士后科学基金资助项目(2020M672228)。
